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Fix flake on rabbitmq_mqtt auth_SUITE #13180
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This PR doesn't fix the flake. I can repro the flake locally as follows:
{error, {client_identifier_not_valid, _}} = emqtt:connect(C), timer:sleep(1), unlink(C).which makes the test fail with:
That's the flake which we also observed in CI.
The correct fix is to unlink first, then connect.
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i cannot reproduce it locally and i dont see CI failing because of this . I can modify the test as you suggest though.
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I still dont understand what you are suggesting. I am expecting that when the user connects it fails because the client_id is not valid. That is exactly what it is doing line 594.
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Can you send me the link to the failed job in CI where this test case is failing ?
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Yes, here are two flakes failing due to
{'EXIT',{shutdown,client_identifier_not_valid}}:There was a problem hiding this comment.
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The CT test case process runs concurrently with the MQTT connection process. CI can fail if the CT test case process executes
unlink(C)after receiving the EXIT signal.There was a problem hiding this comment.
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I'm suggesting to flip the two lines, i.e. to unlink before the expected failure as done in many other places in this test suite, e.g. in:
rabbitmq-server/deps/rabbitmq_mqtt/test/auth_SUITE.erl
Lines 810 to 812 in 3a61274
rabbitmq-server/deps/rabbitmq_mqtt/test/auth_SUITE.erl
Lines 945 to 947 in 3a61274
rabbitmq-server/deps/rabbitmq_mqtt/test/auth_SUITE.erl
Lines 1227 to 1228 in 3a61274
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those ci failures are because this change has not been merged yet
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Regardless i have committed that change.
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but in this PR, with just my changes you dont see the flake. You will see the flake in other CI which do not have this fix.